Sum and Difference Formulas

Which of the following are equivalent to cos2u?

•  $\cos^2u-\sin^2u$  

•  $2\cos^2u-1$  

•  $1-2\sin^2u$  

•  $1-\sin^2u$  

•  $\sin^2u-\cos^2u$  

Tags

CCSS.HSF.IF.C.8

CCSS.HSF.TF.C.8

CCSS.HSF.TF.C.9

sin (A - B) = (leave no spaces when typing answer)

Tags

CCSS.HSF.TF.C.9

cos (A - B)= (leave no spaces in answer)

Tags

CCSS.HSF.TF.C.9

cos (A + B)= (leave no spaces in answer)

Tags

CCSS.HSF.TF.C.9

tan u/2 =

• $\frac{\sin\ u}{1+\cos\ u}$

• $\frac{\cos\ u}{1+\sin u}$

• $\frac{1+\cos u}{\sin u}$

• $\frac{\sin u}{1-\cos u}$

• $\frac{1+\sin u}{\cos u}$

Tags

CCSS.HSF.TF.C.8

CCSS.HSF.TF.C.9

sin 2u = (leave no spaces in answer)

Tags

CCSS.HSF.TF.C.9

tan 2u =

• $\frac{2\tan u}{1-\tan^2u}$

• $\frac{\tan^2u}{1+\tan u}$

• $\frac{2\tan u}{1+\tan^2u}$

• $\frac{\tan^2u}{1-\tan u}$

Tags

CCSS.HSF.TF.C.9

sin u/2 =

• $\pm\sqrt{\frac{1-\cos u}{2}}$

• $\pm\sqrt{\frac{1+\cos u}{2}}$

• $\pm\sqrt{\frac{1+\sin u}{\cos u}}$

• $\pm\sqrt{\frac{1-\sin u}{\cos u}}$

Tags

CCSS.HSF.TF.C.8

CCSS.HSF.TF.C.9

cos u/2 =

• $\pm\sqrt{\frac{1+\cos u}{2}}$

• $\pm\sqrt{\frac{1-\sin u}{2}}$

• $\pm\sqrt{\frac{1+\sin u}{\cos u}}$

• $\pm\sqrt{\frac{1-\cos u}{\sin u}}$

Tags

CCSS.HSF.TF.C.9

 $\frac{1-\cos u}{\sin u}=$